package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.SkuHasStockVo;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Slf4j
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    private WareSkuDao wareSkuDao;
    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Autowired
    private ProductFeignService productFeignService;
    @Autowired
    private WareOrderTaskService orderTaskService;
    @Autowired
    private WareOrderTaskDetailService orderTaskDetailService;
    @Autowired
    private OrderFeignService orderFeignService;


    /**
     * 解锁库存
     *
     * @param skuId        商品sku id
     * @param wareId       仓库id
     * @param num          数量
     * @param taskDetailId 库存工作单详情id
     */
    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        WareSkuDao baseMapper = this.baseMapper;
        baseMapper.unLockStock(skuId, wareId, num);
        //    更新库存工作详单的状态,
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        //更新为已解锁
        entity.setLockStatus(2);
        orderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * 新增的查询条件
         * skuId:
         * wareId: 1
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //如果还没有这个库存记录就是新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        //如果集合为空，执行增加操作
        if (CollectionUtils.isEmpty(entities)) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setWareId(wareId);
            skuEntity.setStock(skuNum);
            //todo 远程查询sku名字，如果失败，整个事物无需回滚
            //自己catch掉异常，就不会抛出，就不会回滚
            //todo 还有什么办法可以让事物不回滚
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {
            }

            skuEntity.setStockLocked(0);
            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            //    select SUM(stock-stock_locked) from `wms_ware_sku` where sku_id=1;
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * rollbackFor = NoStockException.class
     * 默认是运行时异常都会回滚
     * 为某个订单锁定库存
     * <p>
     * 库存解锁场景：
     * 1）、下订单成功，订单过期了没有支付，被系统自动取消、被用户手动取消
     * <p>
     * 2)、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);
        //1、按照下单的收货地址，找到一个就近仓库，锁定库存
        //1、 找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> skuWareHasStocks = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHashStock(skuId);
            stock.setWareId(wareIds);
            stock.setNum(item.getCount());
            return stock;
        }).collect(Collectors.toList());


        //2、锁定库存
        for (SkuWareHasStock hasStock : skuWareHasStocks) {
            Boolean skuStock = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个商品
                throw new NoStockException(skuId);
            }

            //1、如果每一个商品都锁定成功，将当前锁定了几件的工作详情单发给MQ
            //2、如果锁定失败，前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于数据查询不到id,所以不用解锁
            //
            for (Long wareId : wareIds) {
                //成功返回1，否则0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStock = true;
                    // TODO: 2022/3/17 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, null, hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    //String exchange, String routingKey, Object message, MessagePostProcessor messagePostProcessor,CorrelationData correlationData
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());

                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, detailTo);
                    //只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetail(detailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    //当前仓库锁失败，重试下一个仓库
                }

            }
            if (skuStock == false) {
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        //肯定全部都是成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据关于这个订单的锁定库存信息
        //    有：证明库存锁定成功了
        //        解锁：订单情况
        //            1、没有这个订单，必须解锁
        //            2、有这个订单，不是解锁库存
        //                订单状态：已经取消：解锁库存
        //                没取消：不能解锁
        //没有：库存锁定失败了，库存回滚了，这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            //根据订单号查询订单状态
            String orderSn = taskEntity.getOrderSn();
            //根据订单号，远程查询订单
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                //4是已取消
                if (data == null || data.getStatus() == 4) {
                    //订单不存在
                    //订单已经被取消，才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作详单，状态1，已锁定，但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                //消息拒绝以后重新放入队列里面，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
            // 解锁
        } else {
            //无需解锁
        }
    }
    /**
     * 防止订单服务卡顿，导致订单状态一直改不了，库存消息优先到期，查订单状态新建状态，什么都不做就走了
     * 导致卡顿的订单，永远不能解锁库存
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查询一下最新的库存状态，防止重复解锁库存
        WareOrderTaskEntity task=orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id).eq("lock_status", 1));
        //Long skuId, Long wareId, Integer num, Long taskDetailId
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }


    @Data
    class SkuWareHasStock {
        private Long skuId;
        //几件商品
        private Integer num;
        private List<Long> wareId;
    }

}